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US 9,853,653 B2Granted
Error cancellation in a current digital-to-analog converter of a continuous-time sigma-delta modulator
AssigneeMediatek Inc.
InventorTsung-Kai Kao
Life of this patent
Estimating the term…
Abstract
Apparatus and methods for reducing noise and distortion in current digital-to-analog converters (IDACs). Compensating capacitors may be connected to current sources in an IDAC. The compensating capacitors may be driven with signals 5 derived from the output of the IDAC to cancel transient current spikes that would otherwise occur on the output of the IDAC.
Claims27
A current digital-to-analog converter (IDAC) comprising:
- a first current source arranged to provide current to a first output and/or a second current source arranged to pull current from the first output;
- a first compensating capacitor connected to the first current source and/or a second compensating capacitor connected to the second current source;
- and
- driving circuitry configured to supply current to the first compensating capacitor and/or the second compensating capacitor.
1 more element
A current digital-to-analog converter (IDAC) comprising:
- a first current source arranged to provide current to or pull current from a first output;
- a first compensating capacitor connected to the first current source;
- a reference node arranged to connect the first output to a reference potential;
- and
- driving circuitry configured to supply current to the first compensating capacitor.
2 more elements
A method for converting a digital signal to an analog signal, the method comprising:
- driving a first switch connected between a first current source and a first output;
- amplifying a first signal from the first output when the first switch is driven to connect the first current source and the first output;
- and
- providing the amplified first signal from the first output to a first compensating capacitor connected to the first current source.
1 more element
Dependencies are inferred from the claim text.